Question

y varies inversely with x, and x=150 when y=30. Find the inverse variation equation and use it to find the value of x when y=90
a. 1/5
b. 9/5
c. 5
d. 5/9
PLEASE HELP ME!

Answer 1

y=k/x
to find k:
30=k/150
k=30*50=1500
so equation is:
y=1500/x
now finf value of x, when y =90
90=1500/x
x=1500/90 = 150/9

Answer 2

so what that equal too? 5/9???

Answer 3

150/9=50/3

Answer 4

than what?

Answer 5

that's it

Answer 6

but it doesn't match to any of the answers though

Answer 7

ups, i made a mistake, :)
y=k/x
to find k:
30=k/150
k=30*150=4500
so equation is:
y=4500/x
now finf value of x, when y =90
90=4500/x
x=4500/90 = 450/9=50

Answer 8

so then is it d??

Answer 9

no, it's x=50, but it doesn't mach any answer. Are you sure that x=150 when y=30 and no
x=15 when y=30

Answer 10

yeah i'm sure...

Answer 11

so x=50 is the answer

Answer 12

so c???

Answer 13

the most probable is c, becouse i think there is a mistake in the problem